In the steady state, cardiac output equals. venous return. Factors that cause hypereffective heart. Sympathetic stimulation can increase the effectiveness of the heart via: (2) increasing the strength of heart contraction. Factors that can cause a hypoeffective heart: (1) coronary artery blockage.
Thursday, March 19, 2015 - 11:09. Ed Sheeran has added yet another amazing accolade to his collection with the news that his global smash hit sophomore album X has hit the 2 million sales mark, joining a select band of chosen superstars to hit the same achievement.
View as Grid View as List. 1  Getty Images Carrie Underwood - 20.1 million albums sold. 2  Getty Images Kelly Clarkson - 17.9 million albums sold. 3  Getty Images Chris Daughtry - 9 million albums sold.  Getty Images Clay Aiken - 5.1 million albums 1  sold. Getty Images Fantasia Barrino - 3.5 million albums sold.